wheel ACURA RL KA9 1996 Service Workshop Manual

Front Brak e Pad s
Inspectio n an d Replacemen t
• Neve r us e a n ai r hos e o r dr y brus h t o clea n brake
assemblies .
• Us e a n OSHA-approve d vacuu m cleane r t o avoi d
breathin g brak e dust .
1 . Loose n th e fron t whee l nut s slightly , the n rais e th e
vehicle , an d suppor t i t o n safet y stands . Remov e
th e fron t wheels .
2 . Remov e th e brak e hos e bracke t fro m th e knuckle .
BRAKE HOS E BRACKE T
CALIPE R BOL T
CALIPE R BOD Y
3. Hol d th e calipe r pi n wit h a wrench , bein g carefu l
not t o damag e th e pi n boot . Remov e th e calipe r bol t
wit h anothe r wrench , an d pivo t th e calipe r u p ou t o f
the way .
NOTE : Chec k th e hose s an d pi n boot s fo r damag e
an d deterioration .
4 . Remov e th e pa d shims , pa d retainers , an d pads .
NOTE : '96 , '97 , '99 , '0 0 an d 0 1 model s shown .
PAD RETAINER S
INNER PA D SHIM SCheck fo r weakness .
OUTE R PA D
Chec k fo r wear .
OUTE R PA D SHI M
Chec k fo r weakness .
NOTE: Replac e th e shim s togethe r wit h th e pad s a s a set . 5
. Usin g vernie r calipers , measur e th e thicknes s of
eac h brak e pa d lining .
Brake Pa d Thickness :
Standard: 10. 5 - 11. 5 m m (0.4 1 - 0.4 5 in )
Servic e Limit : 1. 6 m m (0.0 6 in )
'96 , '97 , '99 , '0 0 an d 0 1 models :
BACKIN G PLAT E
NOTE: Measuremen t doe s no t includ e pa d backin g
plat e thickness .
6 . I f th e brak e pa d thicknes s i s les s tha n th e servic e
limit , replac e th e fron t pad s a s a set .
7 . Clea n th e calipe r thoroughly ; remov e an y rust , an d
chec k fo r groove s an d cracks .
8 . Chec k th e brak e dis c fo r damag e an d cracks .
9 . Instal l th e pa d retainers .
PAD RETAINER S
BACKIN
G PLAT E
'9 8 mode l onl y
INNE R PA DChec k fo r wear .
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Front Brak e Dis c
Disc Runou t Inspectio n
1. Loose n th e fron t whee l nut s slightly , the n rais e th e
vehicle , an d mak e sur e i t i s securel y supported .
Remov e th e fron t wheels .
2 . Remov e th e brak e pad s (se e pag e 19-10 ).
3 .
4 .
5 .
Inspec t th e dis c surfac e fo r damag e an d cracks .
Clean th e dis c thoroughly , an d remov e al l rust .
Us e whee l nut s an d suitabl e plai n washer s t o hol d
th e dis c securel y agains t th e hub , the n moun t a dia l
indicato r a s shown , an d measur e th e runou t a t
1 0 m m (0. 4 in ) fro m th e oute r edg e o f th e disc .
Brak e Dis c Runout :
Service Limit : 0.1 0 m m (0.00 4 in )
10 m m(0.4 in )
WHEE L NU T AN DPLAI N WASHE R108 N- m(11 kgf-m , 8 0 Ibf-ft )
If th e dis c i s beyon d th e servic e limit , refinis h th e
brak e dis c wit h a n on-ca r brak e lathe . Th e Kwik -
Lathe produce d b y Kwik-wa y Manufacturin g Co .
and th e "Fron t Brak e Dis c Lathe " offere d b y Snap -
on Tool s Co . ar e approve d fo r thi s operation .
Max. Refinis h Limit :
'9 6 - 9 8 models :
21.0 mm (0.8 3 in)
'99 - 0 1 models :
26.0 mm (1.0 2 in)
NOTE : A ne w dis c shoul d b e refinishe d i f it s runou t
i s greate r tha n 0.1 0 m m (0.00 4 in )
Dis c Thicknes s an d Parallelis m
Inspectio n
1. Loose n th e fron t whee l nut s slightly , the n rais e th e
vehicle , an d mak e sur e i t i s securel y supported .
Remov e th e fron t wheels .
2 . Remov e th e brak e pad s (se e pag e 19-10 ).
3 .
4.
Usin g a micrometer , measur e dis c thicknes s a t
eigh t points , approximatel y 45 ° apar t an d 1 0 m m
(0.4 in ) i n fro m th e oute r edg e o f th e disc .
MICROMETE R
Brake Dis c Thickness :
'9 6 - 9 8 models :
Standard : 22. 9 - 23. 1 m m (0.9 0 - 0.9 1 in )
Max . Refinishin g Limit : 21. 0 m m (0.8 3 in )
'9 9 - 0 1 models :
Standard : 27. 9 - 28. 1 m m (1.1 0 - 1.1 1 in )
Max . Refinishin g Limit : 26. 0 m m (1.0 2 in )
NOTE : Replac e th e brak e dis c i f th e smalles t mea -
suremen t i s les s tha n th e max . refinishin g limit .
Brak e Dis c Parallelism : 0.01 5 m m (0.000 6 in ) max .
NOTE : Thi s i s th e maximu m allowabl e differenc e
between th e thicknes s measurements .
I f th e dis c i s beyon d th e servic e limi t fo r parallelism ,
refinis h th e brak e dis c wit h a n on-ca r brak e lathe .
Th e Kwik-Lath e produce d b y Kwik-Wa y Manufac -
turin g Co . an d th e "Fron t Brak e Dis c Lathe " offere d
b y Snap-o n Tool s Co . ar e approve d fo r thi s opera -
tion.
NOTE : Se e sectio n 1 8 fo r brak e dis c replacement .
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Rear Brake Pads

Inspection and Replacement

Never use an air hose or dry brush to clean brake

assemblies.

Use an OSHA-approved vacuum cleaner to avoid

breathing brake dust.

Block the front wheels before jacking up the rear of

the vehicle.

NOTE: '96 - 98 models shown.

1. Block the front wheels, loosen the rear wheel nuts

slightly, support the rear of the vehicle on safety

stands, then remove the rear wheels.

2. Remove the" brake hose bracket from the trailing arm.

BRAKE HOSE BRACKET

CALIPER BOLT

3.
CALIPER

Remove the caliper bolt, and pivot the caliper up out

of the way. '99 - 01 models only: Hold the caliper pin

with a wrench, being careful not to damage the pin

boot. Remove the caliper bolt with another wrench,

and pivot the caliper up out of the way.

CAUTION:

Thoroughly clean the outside of the caliper to

prevent dust and dirt from entering inside.

Support the caliper with a piece of wire so it

does not hang from the brake hose.

NOTE: Check the hoses and pin boots for damage

and deterioration.

4. Remove the pad shims, pad retainers, and pads.

INNER PAD SHIMS

Check for weakness.

BRAKE PADS

Check for wear.

OUTER PAD SHIM

Check for weakness.
5. Using vernier calipers, measure the thickness of

each brake pad lining.

Brake Pad Thickness:

Standard: 8.5-9.5 mm (0.33-0.37 in)

Service Limit: 1.6 mm (0.06 in)

BACKING PLATE

NOTE: Measurement does not include pad backing

plate thickness.

6. If the brake pad thickness is less than the service

limit, replace the rear pads as a set.

7. Clean the caliper thoroughly; remove any rust, and

check for grooves and cracks.

8. Check the brake disc for damage and cracks.

9. Install the pad retainers.

PAD RETAINERS

Check for weakness.

CALIPER BRACKET

Check for cracks.ProCarManuals.com

Rear Brak e Dis c
Disc Runou t Inspectio n
1. Loose n th e rea r whee l nut s slightly , the n rais e th e
vehicl e an d mak e sur e i t i s securel y supported .
Remov e th e rea r wheels .
2 . Remov e th e brak e pad s (se e pag e 19-17 ).
3 . Inspec t th e dis c surfac e fo r damag e an d cracks .
Clea n th e dis c thoroughly , an d remov e al l rust .
4 . Us e whee l nut s an d suitabl e plai n washer s t o hol d
th e dis c securel y agains t th e hub , the n moun t a dia l
indicato r a s shown , an d measur e th e runou t a t 1 0 m m
(0.4 in ) fro m th e oute r edg e o f th e disc .
Brak e Dis c Runout :
Servic e Limit : 0.1 5 m m (0.00 6 in )
WHEE L NU T AN DPLAI N WASHE R108 N- m(11 kgf-m , 8 0 Ibf-ft )
DIA L INDICATO R
5. I f th e dis c i s beyon d th e servic e limit , refinis h th e brak e
disc .
Max . Refinishin g Limit : 7. 5 m m (0.3 0 in )
'9 6 - 9 8 models :
7.5 m m (0.3 0 in)
'99 - 0 1 models :
10.0 mm (0.3 9 in)
NOTE : A ne w dis c shoul d b e refinishe d i f it s runou t
i s greate r tha n 0.1 5 m m (0.00 6 in) .
Dis c Thicknes s an d Parallelis m
Inspectio n
1. Loose n th e rea r whee l nut s slightly , the n rais e th e
vehicle , an d mak e sur e i t i s securel y supported .
Remov e th e rea r wheels .
2 . Remov e th e brak e pad s (se e pag e 19-17 ).
3 . Usin g a micrometer , measur e dis c thicknes s a t
eigh t points , approximatel y 45 ° apar t an d 1 0 m m
(0.4 in ) i n fro m th e oute r edg e o f th e disc .
MICROMETE R
Brake Dis c Thickness :
'9 6 - 9 8 models :
Standard : 8. 9 - 9. 1 m m
(0.35 0 - 0.35 8 in )
Max . Refinishin g Limit : 7. 5 m m (0.3 0 in )
'9 9 - 0 1 models :
Standard : 11.9-12. 1 m m
(0.46 9 - 0.47 6 in )
Max . Refinishin g Limit : 10. 0 m m (0.3 9 in )
NOTE : Replac e th e brak e dis c i f th e smalles t mea -
suremen t i s les s tha n th e max . refinishin g limit .
Brak e Dis c Parallelism : 0.01 5 m m
(0.000 6 in ) max .
NOTE : Thi s i s th e maximu m allowabl e differenc e
betwee n th e thicknes s measurements .
4 . I f th e dis c i s beyon d th e servic e limi t fo r parallelism ,
refinis h th e brak e disc .
NOTE : Se e sectio n 1 8 fo r brak e dis c replacement .
10 m m (0. 4 in)
10 m m (0. 4 in)
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Parking Brak e
Inspectio n
Never us e a n ai r hos e o r dr y brus h t o clea n brak e
assemblies .
Use a n OSHA-approve d vacuu m cleane r t o avoi d
breathin g brak e dust .
Contaminate d brak e lining s o r drum s reduc e stoppin g
ability .
Bloc k th e fron t wheel s befor e jackin g u p th e rea r o f
th e vehicle . 1
. Bloc k th e fron t wheels , loose n th e rea r whee l nut s
slightly , suppor t th e rea r of the vehicl e o n safet y
stand s (se e sectio n 1 ), the n remov e th e rea r wheels .
2 . Remov e th e rea r calipe r an d rea r brak e disc/dru m
(se e sectio n 18 ).
TENSIO N PI NBACKIN G PLAT E
'96 - 9 7 models :
UPPER RETUR N SPRING S
Chec k fo r weaknes s
an d damag e
CONNECTIN G RO D
16 m m FLANG E NU T
13 7 N- m (1 4 kgf-m , 10 1 Ibf-ft )
ADJUSTE R ASSEMBL Y
Chec k ratche t teet h
fo r wea r an d damage .
LOWE R RETUR N SPRIN G
Chec k fo r weaknes s
an d damage . PARKIN
G BRAK E LEVE R
PARKIN G BRAK E SHO E
Chec k fo r wear .
RETAINE R SPRIN G
Instal l securel y o n
tensio n pin .ROD SPRIN GCheck fo r weaknes s
an d damage .
'98 - 0 1 models :BACKIN G PLAT E
UPPE R RETUR N SPRING S
Chec k fo r weaknes s
an d damage .
CONNECTIN G RO D
LOWE R RETUR N SPRIN G
Chec k fo r weaknes s
an d damage .
ADJUSTE R ASSEMBL Y
Check ratche t teet hfor wea r an d damage . 1
6 m m FLANG E NU T
13 7 N- m (1 4 kgf-m , 10 1 Ibf-ft )
1 0 m m FLANG E NU T
3 8 N- m (3. 9 kgf-m , 2 8 Ibf-ft )
PARKIN G BRAK E LEVE R
RO D SPRIN G PARKIN
G BRAK E SHO E
Chec k fo r wear .
Chec k fo r weaknes s RETAINE R SPRIN G
an d damage . Instal l securel y o n
tensio n pin .
PIVO
T PI N
WAV
E WASHE R
U-CLI
P
Replace .
WAV
E WASHE R
PIVO T PI NU-CLI
P
Replace .
TENSION PI N
10 m m FLANG E NU T
3 8 N- m (3. 9 kgf-m , 2 8 Ibf-ft )
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Component Locations

ABS CONTROL UNIT

MODULATOR UNIT
SERVICE CHECK CONNECTOR (2P)

ABS INSPECTION CONNECTOR (6P)

RIGHT-REAR WHEEL SENSOR

RIGHT-FRONT WHEEL

SENSOR CONNECTOR

RIGHT-FRONT

WHEEL SENSOR
LEFT-REAR WHEEL

SENSOR CONNECTOR

LEFT-REAR

WHEEL SENSOR

RIGHT-REAR WHEEL

SENSOR CONNECTOR

UNDER-HOOD

RELAY BOX B

UNDER-HOOD

FUSE/RELAY BOX
UNDER-DASH FUSE/RELAY BOX

LEFT-FRONT WHEEL SENSOR

LEFT-FRONT WHEEL

SENSOR CONNECTOR

GAUGE ASSEMBLY:

ABS INDICATOR LIGHT

UNDER-DASH FUSE/RELAY BOX:

METER

(7.5 A) FUSE
ABS B2

(15 A) FUSE

ABS B1

(20 A) FUSE

METER

(15 A) FUSE
BATTERY

(120 A) FUSE

ABS MOTOR (40 A) FUSE

IG SW (50 A) FUSE

UNDER-HOOD RELAY BOX C:

REAR FAIL-SAFE RELAY

METER RELAY

FRONT FAIL-SAFE RELAY
ABS
UNIT

(7.5 A) FUSE
STOP/HORN

(ISA) FUSE
ABS PUMP

MOTOR RELAY
UNDER-HOOD FUSE/RELAY BOX:

ECU

(20 A) FUSE

R/C MIRROR

(7.5 A) FUSEProCarManuals.com

Troubleshooting Precautions

ABS Indicator Light:

The ABS indicator light comes on for 3 seconds and then goes off when the control unit detects no problem during the ini-

tial diagnosis right after the engine starts. However, the ABS indicator light can stay on for up to 40 seconds when the

control unit starts to check for pump overrun, etc. during the initial diagnosis. The ABS indicator light comes on, and the

ABS control unit memorizes the diagnostic trouble code (DTC) under certain conditions.

The parking brake is applied for more than 30 seconds while the vehicle is being driven. (DTC 2-1)

The transmission downshifted excessively. (DTC 4-1, 4-2)

The vehicle loses traction, and the front wheels spin for more than 1 minute when starting from a stuck condition on a

muddy, snowy, or sandy road. (DTC 4-8)

Tire adhesion is lost due to excessive cornering speed. (DTC 5, 5-4, 5-8)

The vehicle is driven on an extremely rough road. (DTC 8-1)

The vehicle is interfered by strong radio waves (noise), for example, illegal radio, etc. (DTC 8-2)

NOTE: If there is any trouble in the system, the ABS indicator light comes on during driving.

Diagnostic Trouble Code (DTC):

When the control unit detects a problem and the ABS indicator light comes on, the control unit memorizes the DTC.

The control unit has three memory registers. When a problem occurs, the control unit stores the DTC in the first memory

register. If another problem occurs, or the same problem occurs again, the control unit moves the first DTC to the next

memory register, and stores the second DTC in the first register. If there's a third problem occurrence, the two existing

DTCs are moved up one register, and the third DTC is stored in the first register. If problems continue to occur, the oldest

problem is moved out of the last register and lost, and the most recent problem is stored in the first register. When the

same problem occurs three times, the same DTC is stored in all memory registers. (Refer to the Symptom-to-System

Chart for diagnostic period.)

The most recent DTC is indicated first, and the oldest DTC is indicated last.

The DTCs are erased from the control unit when the ABS control unit +B2 power supply or connector is disconnected.

The control unit's memory can be erased by disconnecting the ABS B2 fuse for more than 3 seconds.

Self-diagnosis:

There are three self-diagnoses described below.

Initial diagnosis: Performed right after the engine starts until the ABS indicator light goes off.

Regular diagnosis: Continuously performed (under some conditions) after the ABS indicator light goes off until the

engine stops.

Individual part/system diagnosis: Diagnosis about a specific part/system under its operating conditions.

The CPU (central processing unit) controls the following when it detects a problem during self-diagnosis:

Turns the ABS indicator light ON.

Turns the front and rear fail-safe relays off.

Stops the ABS control.

Stops the ABS pump. (The pump may work under some conditions.)

After the DTC is stored in the control unit, the CPU stops self-diagnosis.ProCarManuals.com

DTC 4- 1 (Right-front) , 4- 2 (Left-front) , 4- 4 (Right-rear) , 4- 8 (Left-rear) :
Whee l Senso r
The AB S contro l uni t monitor s th e whee l senso r signa l durin g th e regula r diagnosi s (a t speed s o f 6 mp h (1 0 km/h ) o r
more) . Thi s diagnosi s i s no t performe d whe n th e parkin g brak e signa l i s ON . Th e AB S contro l uni t turn s th e AB S indicator
ligh t o n i f i t detect s tha t ther e i s n o whee l senso r signa l fro m th e wheel .
Possibl e causes :
Open circuit , interna l shor t o r shor t t o bod y groun d in th e whee l senso r
Ope n circui t o r shor t t o bod y groun d in th e positiv e (+ ) wir e betwee n th e whee l senso r an d AB S contro l uni t
Ope n circui t o r shor t t o bod y groun d i n th e negativ e (- ) wir e betwee n th e whee l senso r an d AB S contro l uni t
Positiv e (+ ) wir e shorte d t o th e negativ e (- ) wir e betwee n th e whee l senso r an d AB S contro l uni t
Loos e connecto r o r poo r contac t o f terminal s
Improper whee l senso r ai r ga p
Fault y AB S contro l uni t
Missin g o r damage d pulse r
Modulato r doe s no t decreas e pressur e properl y
Whee l loc k b y downshif t
Is th e resistanc e a s specified ?— Front : 700-1,10 0— Rear : 1,400-2,00 0
Chec k th e continuit y o f th e whee l
sensor :Check fo r continuit y betwee n th e
appropriat e whee l senso r 2 P con -
necto r termina l No . 2 an d bod y
ground .
Is ther e continuity ?
(To pag e 19-66 )
WHEE L SENSO R 2P CONNECTO R
DTC4-14- 24- 44-8
Appropriat e Whee l Senso rRight-fron tLeft-frontRight-rea rLeft-rear
Wire sid e o f femal e terminal s
Replac e th e appropriat e whee l
sensor .
Replac e th e appropriat e whee lsensor .
When vehicl e is driven , ABS
indicato r ligh t i s ON .
Wit h th e SC S servic e connec -
to r connecte d (se e pag e 19-40 ),
DTC s 4-1 , 4-2 , 4- 4 and/o r 4- 8
ar e indicated .
Chec k th e whee l senso r resis -
tance :
1 . Disconnec t th e appropriat e
whee l sensor * 2 P connector .
2 . Measur e th e resistanc e
betwee n th e No . 1 an d No . 2
terminals .
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(From pag e 19-66 ) AB S CONTRO L UNI T 22 P CONNECTO R
FLW (+ ) (GRN/BLU )
Chec k th e whee l senso r resis -
tance:1. Connec t th e whee l senso r 2 Pconnector .2. Measur e th e resistanc e
betwee n th e AB S contro l uni t
22 P connecto r positiv e sid e
an d negativ e sid e terminal s o f
th e appropriat e whee l sensor* .
I s th e resistanc e a s specified ?
— Front : 700 - 1,10 0— Rear : 1,400-2,00 0 Chec
k fo r a n ope n i n th e whee l
senso r circuit :1. Connec t th e AB S contro l uni t22P connecto r appropriat epositive sid e terminal * t o bod ygroun d wit h a jumpe r wire .2. Disconnec t th e appropriat ewheel sensor * 2 P connector .3. Chec k fo r continuit y betwee ntermina l No . 2 an d bod yground . Wir
e sid e o f femal e terminal s
NOTE : Chec k wit h th e AB S contro l uni t 22 P
connecto r disconnected .
FL W (+ ) (GRN/BLU )FR
W (+ ) (GRN/BLK )
WHEE L SENSO R 2 P CONNECTO R
Termina l sid e o f
mal e terminal s
I s ther e continuity ? Repai
r ope n in th e positiv e (+ ) cir -
cui t wir e betwee n th e AB S con -
tro l uni t an d appropriat e whee l
sensor .
Repair ope n in th e negativ e (- ) cir -
cui t wir e betwee n th e AB S con -
tro l uni t an d appropriat e whee l
sensor .
Correc t th e appropriat e whee lsensor ai r gap .
Measur e th e appropriat e whee l
senso r ai r ga p (se e pag e 19-103) .
Is th e ai r ga p OK ?
Chec k th e AB S functio n (se e pag e19-95 ).
JUMPE R WIR E JUMPE
R WIR E
Appropriat e Termina lPositive Sid e Negativ e Sid e4-1 (Right-front ) No . 5 : FR W (+ ) No . 4 : FR W (-)4- 2 (Left-front ) No . 3 : FL W (+ ) No . 2 : FL W (-)4- 4 (Right-rear ) No . 15 : RR W (+ ) No . 16 : RR W (-)4- 8 (Left-rear ) No.13 : RL W (+ ) No . 14 : RL W (-)
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Troubleshooting
DTC 5 , 5-4 , 5-8 : Rea r Whee l Loc k
The AB S contro l uni t monitor s th e rea r whee l senso r signal s durin g th e regula r diagnosi s (durin g driving) . Thi s diagnosi s
is no t performe d whe n th e parkin g brak e signa l i s ON . Th e AB S contro l uni t turn s th e AB S indicato r ligh t o n if i t detect s n o
signal(s ) fro m th e rea r whee l sensor(s ) du e to , fo r example , rea r whee l lock .
Possibl e causes :
Wheel spi n durin g cornerin g
Open circuit , interna l shor t o r shor t t o th e bod y groun d in th e whee l senso r syste m
Rear brak e dra g
Modulato r doe s no t decreas e pressur e properl y
Faulty AB S contro l uni t
— Whe n vehicl e i s driven , ABSindicato r ligh t i s ON .— Wit h th e SC S servic e connec -tor connecte d (se e pag e 19-40 ),DTC s 5 , 5- 4 and/o r 5- 8 ar e indi -
cated .
Chec k th e PAR K circuit :
1. Tur n th e ignitio n switc h O N (II) .2. Pres s th e parking brake pedal .
Doe s th e brak e syste m ligh t
com e on ? Parkin
g brak e switc h stuc k OFF .
Repai r ope n circui t betwee n th e
under-das h fuse/rela y bo x an d
parkin g brak e switch .
NOTE:The self-diagnosi s o f th e whee l senso r i s per -forme d i n thi s step .
Test-driv e wit h th e parkin g brak e released .
Does th e AB S indicato r ligh tcom e on ?
Chec k fo r rea r brak e drag :
1 . Rais e th e rea r o f th e vehicle ,
and suppor t i t wit h safet ystands (se e sectio n 1 ).2 . Spi n th e lef t and/o r righ t rea rwhee l an d chec k fo r brak e
drag . I
s cod e 4- 4 o r 4- 8 indicated ?
Perform th e troubleshootin g fo rthe rea r whee l sensor .
Perfor m th e appropriat e trouble -
shootin g fo r th e code .
Doe s th e brak e drag ?
Repair th e rea r brak e drag .
Check th e AB S functio n (se epage 19-95 ).
Th e probabl e caus e wa s tha t
tractio n wa s los t du e t o exces -
siv e cornerin g speed , etc .
Chec
k th e self-diagnosis :
Test-driv e th e vehicl e a t speed s
of 6 mp h (1 0 km/h ) o r more .
Confir m th e DT C (se e pag e 19-40 ).
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